By the end of June, Kajsa Fernström Nåtby was homesick. The native Swede had just finished a 5-month internship with her country’s diplomatic office near the UN headquarters in Manhattan, darting between debates on migration and ocean plastic. Now, her parents were pleading for her to hop on an 8-hour flight across the Atlantic and rush home. But Fernström Nåtby had a different idea.